EP1001236B1 - Verfahren zur Gewinnung von ultrareinem Stickstoff - Google Patents
Verfahren zur Gewinnung von ultrareinem Stickstoff Download PDFInfo
- Publication number
- EP1001236B1 EP1001236B1 EP99122146A EP99122146A EP1001236B1 EP 1001236 B1 EP1001236 B1 EP 1001236B1 EP 99122146 A EP99122146 A EP 99122146A EP 99122146 A EP99122146 A EP 99122146A EP 1001236 B1 EP1001236 B1 EP 1001236B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- column
- nitrogen
- free
- low
- pressure column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 48
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 10
- 238000010992 reflux Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000005194 fractionation Methods 0.000 claims 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 claims 1
- 239000000047 product Substances 0.000 description 18
- 238000000926 separation method Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 238000009835 boiling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002631 hypothermal effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
- F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
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- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
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- F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
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- F25J3/04351—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using quasi-closed loop internal vapor compression refrigeration cycles, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
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- Y10S62/00—Refrigeration
- Y10S62/92—Carbon monoxide
Definitions
- the invention relates to a method and an apparatus for the extraction of ultra-pure nitrogen by cryogenic decomposition of an oxygen-free Pressure nitrogen fraction.
- the object of the invention is therefore to avoid this disadvantage and Reduce energy consumption.
- Another object of the invention is to provide a method that either with a liquid pressure nitrogen fraction directly from the pressure column or is operated from a tank with liquid pressure column nitrogen.
- the ultrapure nitrogen is obtained in liquid form and is easier to transport in this form and therefore easier to distribute to customers become.
- the process can also be used universally. Because it can with Connection to an air separation plant (with or without liquid nitrogen tank) or only on a liquid nitrogen tank (with spatial separation from the air separation plant) be used. On an air separation plant with a liquid nitrogen tank also the ultra pure liquid nitrogen can be obtained without the Air separation plant is in operation.
- the carbon monoxide-free top gas upstream of its compression (9) and a top gas of the He-Ne-H 2 column can be combined to form a cold gas stream which is free of carbon monoxide.
- the gas stream formed during the evaporation of the liquid refrigerant and a top gas of the He-Ne-H 2 column can be combined to form a cold gas stream.
- the cold gas stream is advantageously heated in a heat exchanger, compressed and cooled again in countercurrent in the same heat exchanger and then partly in the low-pressure column and partly in the He-Ne-H 2 column for heating the sump used and liquefied except for gaseous residual streams.
- the streams liquefied during the heating of the He-Ne-H 2 column and the low-pressure column can be fed back to the He-Ne-H 2 column.
- the streams liquefied during the heating of the He-Ne-H 2 column and the low-pressure column in the evaporator / condenser of the low-pressure column can liquefy the carbon monoxide-free overhead gas of the low-pressure column except for a residual stream and are at least partially fed as reflux to the He-Ne-H 2 column.
- the disadvantage of an additional investment for the condenser / evaporator is then offset by the advantage, which should not be underestimated, that in the event of air leakage during the compression of the carbon monoxide-free gas stream, the ultra-pure liquid nitrogen cannot be contaminated.
- Ultrapure nitrogen can be drawn off in liquid form from the He-Ne-H 2 column and can be obtained partly as the reflux of the low-pressure column and partly as a liquid ultrapure nitrogen product.
- the ultra pure liquid nitrogen product can be fed to a product tank.
- the ultra pure liquid nitrogen product can be pressurized with a pump, under Use of the cold content in the production of oxygen-free Compressed nitrogen fraction evaporates, warmed up and as a gaseous pressure product Use are fed.
- the process for producing ultra pure Liquid nitrogen product also made and ultra-pure nitrogen gas product thereby making good use of the coldness of the original liquid product become.
- Figure 1 shows a method according to the first variant of the invention with provision of oxygen-free nitrogen for the process from a liquid nitrogen tank.
- Figure 2 shows a method according to the first variant of the invention with provision of oxygen-free nitrogen for the process from a pressure column Rectification system.
- Figure 3 shows a method as in Figure 1, but with an additional Evaporator / condenser, that is, according to the second variant of the invention.
- FIG. 4 shows a method as in FIG. 2 with an additional evaporator / condenser, thus also according to the second variant of the invention.
- Figure 5 shows a method as in Figure 2 for the case of retrofitting a Rectification system with the method according to the first variant of the invention.
- FIG. 1 shows schematically an embodiment of the method according to the invention for the production of ultra-pure nitrogen. Except for a residual content in the range of a few mol-ppm of oxygen-free liquid pressurized nitrogen fraction 1, the pressure is released into a heated low-pressure column 2, which is operated at a pressure between 4.5 and 5.5 bar. In the low-pressure column 2, rising steam is released from the He-Ne-H 2 column 4 of carbon monoxide and thus also of impurities boiling heavier than carbon monoxide, such as argon and the residual oxygen content, depending on the purity requirement, by means of ultrapure nitrogen 3 which is applied at the top as a return line exempted a few mol-ppb.
- the carbon monoxide-free head gas 5 and a head gas 6 of the He-Ne-H 2 column are combined to form a carbon monoxide-free cold gas stream 7, heated in a heat exchanger 8 and cooled again after compression 9 in the same heat exchanger 8.
- the cooled gas stream 10 is used to a part 11 in the low pressure column 2 and to another part 12 in the He-Ne-H 2 column 4 for heating 13, 14 of the sump and liquefied except for gaseous residual streams 15, 16.
- the liquefied streams 17, 18 are fed to the He-Ne-H 2 column 4 as a return.
- the as Insert used liquid pressure nitrogen fraction 1 over a liquid tank 22 a booster pump 23 removed and a heat exchanger 24 in the low pressure column 2 out.
- the ultra-pure Liquid nitrogen product 20 supercooled and then without gaseous Relaxation losses in the product tank 21 relaxed. Because of the hypothermia of the Liquid nitrogen product 20, the product tank 21 can be operated as pressureless Liquid tank to be run.
- FIG. 2 schematically shows the production of the ultra-pure liquid nitrogen product 20 as in FIG. 1.
- the liquid nitrogen fraction 1 used as the insert is different from in the embodiment according to FIG. 1 of a pressure column 25 of a rectification system removed and passed through a heat exchanger 24 into the low pressure column 2.
- the ultra pure liquid nitrogen product 20 is pressurized by a pump 26 in counterflow to the liquid nitrogen fraction 1 via the heat exchanger 24 passed and using the cold content in a condenser 27 and in one Heat exchanger 28 in the extraction of the oxygen-free pressure nitrogen fraction used, evaporated, warmed and as a gaseous ultra-pure printed product 29 fed for further use.
- FIG. 3 schematically shows an embodiment of the method according to the invention using a condenser / evaporator 30.
- the carbon monoxide-free top gas 5 of the low-pressure column 2 (against one by combining the liquefied streams 17, 18 formed liquid refrigerant 31, which evaporates here) liquefied in the condenser / evaporator 30 except for a gaseous residual stream 32 and used in the He-Ne-H 2 column 4 as the return 33.
- a gas stream 5 ′ formed during the evaporation of the liquid refrigerant and the top gas 6 of the He-Ne-H 2 column 4 are combined to form the cold carbon monoxide-free gas stream 7.
- Figure 4 shows schematically an embodiment of the method according to the invention in FIG. 2, but carried out with the condenser / evaporator 30 as in FIG. 3.
- FIG. 5 shows schematically that the inventive method on a existing rectification system can be used.
- the rectification system Condenser 27 added and the heat exchanger 8 receives two additional Passages for the use of the cold of the ultra-pure nitrogen 20 'to be heated the cooling and liquefaction of a partial flow 34 of the air 35 for the Rectification system.
- the ultra-pure heated in the heat exchanger 8 Nitrogen is used as a gaseous ultrapure printed product 29 for further use fed.
- a common feature of the design of the method according to the invention according to Figures 1 to 5 is that all residual gas flows (15, 16, 36 in Figure 1, 2, 5 and 15, 16, 32, 36 in Figure 3, 4) to a cold residual gas stream 37 summarized heated in the heat exchanger 8 and as an impure gas 38 to the Atmosphere.
- m 3 means: m 3 in the normal state at 0 ° C and 1.0133 bar; ie 1m 3 corresponds to 1.25 kg.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Removal Of Specific Substances (AREA)
Description
Claims (8)
- Verfahren zur Gewinnung von ultrareinem Stickstoff durch Tieftemperaturzerlegung einer sauerstofffreien Druckstickstofffraktion bei dem die sauerstofffreie Druckstickstofffraktion (1) entweder flüssig aus einem oberen Bereich einer Drucksäule zur Tieftemperatur-luftzerlegung oder aus einem Flüssigkeitstank (22) mit gespeichertem sauerstofffreiem Stickstoff entnommen wird und in eine in ihrem Sumpf beheizte (13) Niederdrucksäule (2) entspannt wird, wobei in der Niederdrucksäule aufsteigender Dampf gebildet und mit Hilfe eines am Kopf der Niederdrucksäule aufgegebenen Rücklaufes (3) mit ultrareinem Stickstoff von Kohlenmonoxid befreit und am Kopf der Niederdrucksäule als kohlenmonoxidfreies Kopfgas (5, 7) abgezogen wird und wobeientweder kohlenmonoxidfreies Kopfgas (5, 7) der Niederdrucksäule nach einer Druckerhöhung (9) teilweise verflüssigt (13, 14) wird und der verflüssigte Teil (17, 18) in eine in ihrem Sumpf beheizte (14) He-Ne-H2-Säule (4) entspannt wird, aus der der ultrareine Stickstoff (19, 20) flüssig entnommen wird,oder kohlenmonoxidfreies Kopfgas (5) der Niederdrucksäule gegen einen flüssigen Kälteträger (31), der hierbei verdampft wird, in einem KondensatorNerdampfer (30) teilweise verflüssigt wird und ein bei der Verdampfung (30) des flüssigen Kälteträgers entstehender Gasstrom (5', 7) nach einer Druckerhöhung (9) teilweise verflüssigt (13, 14) wird und der verflüssigte Teil (17, 18, 31) als Kälteträger (31) dem Kondensator-Verdampfer (30) zugeführt wird, wobei in dem Kondensator/Verdampfer (30) der Niederdrucksäule das kohlenmonoxidfreie Kopfgas (5) der Niederdrucksäule bis auf einen gasförmig verbleibenden Reststrom (32) verflüssigt und mindestens teilweise als Rücklauf (33) einer He-Ne-H2-Säule (4) zugeführt wird, aus der der ultrareine Stickstoff (19, 20) flüssig entnommen wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das kohlenmonoxidfreie Kopfgas (5) stromaufwärts seiner Verdichtung (9) und ein Kopfgas (6) der He-Ne-H2-Säule (4) zu einem kalten Gasstrom (7), der kohlenmonoxidfrei ist, zusammengefaßt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der bei der Verdampfung (30) des flüssigen Kälteträgers entstehende Gasstrom (5') und ein Kopfgas (6) der He-Ne-H2-Säule (4) zu einem kalten Gasstrom (7) zusammengefaßt werden.
- Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß der kalte Gasstrom (7, 10) in einem Wärmeaustauscher (8) angewärmt, verdichtet (9) und im Gegenstrom im gleichen Wärmetauscher (8) wieder abgekühlt wird und anschließend zu einem Teil (12) in der Niederdrucksäule (2) und zu einem anderen Teil (11) in der He-Ne-H2-Säule (4) zur Beheizung des Sumpfes (13, 14) verwendet und dabei bis auf gasförmig verbleibende Restströme (15, 16) verflüssigt wird.
- Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß ein Teil des aus der He-Ne-H2-Säule flüssig abgezogenen ultrareinen Stickstoffs (19) als der Rücklauf (3) der Niederdrucksäule (2) verwendet wird.
- Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das ultrareine Flüssigstickstoffprodukt (19, 20) einem Produkttank (21) zugeführt wird.
- Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß das ultrareine Flüssigstickstoffprodukt mit einer Pumpe auf Druck gebracht, unter Nutzung des Kälteinhaltes bei der Gewinnung der sauerstofffreien Druckstickstofffraktion verdampft, angewärmt und als gasförmiges Druckprodukt einer Verwendung zugeführt wird.
- Vorrichtung zur Gewinnung von ultrareinem Stickstoff durch Tieftemperaturzerlegung einer sauerstofffreien Druckstickstofffraktion mit Mitteln zum Zuführen einer sauerstofffreien Druckstickstofffraktion aus einem oberen Bereich einer Drucksäule zur Tieftemperatur-Luftzerlegung oder aus einem Flüssigkeitstank mit gespeichertem sauerstofffreiem Stickstoff in eine in ihrem Sumpf beheizte Niederdrucksäule, mit Mitteln zum Aufgeben von ultrareinem Stickstoff als Rücklauf am Kopf der Niederdrucksäule, mit Mitteln zum Abziehen von kohlenmonoxidfreiem Kopfgas vom Kopf der Niederdrucksäule, wobeientweder die Mittel zum Abziehen von kohlenmonoxidfreiem Kopfgas mit Mitteln zur Druckerhöhung (9) und zur anschließenden teilweisen Verflüssigung (13, 14)des kohlenmonoxidfreien Kopfgases verbunden sind, und die Vorrichtung Mittel zur Einleitung des verflüssigten Teils des kohlenmonoxidfreien Kopfgases in eine in ihrem Sumpf beheizte He-Ne-H2-Säule und Mittel zur Entnahme des ultrareinen Stickstoffs in flüssigem Zustand aus der He-Ne-H2-Säule aufweist,oder die Mittel zum Abziehen von kohlenmonoxidfreiem Kopfgas mit einem Kondensator/Verdampfer (30) zur teilweisen Verflüssigung des kohlenmonoxidfreien Kopfgases zur Erzeugung einer Flüssigkeit gegen einen zu einem Gasstrom (5', 7) verdampfenden flüssigen Kälteträger (31) verbunden sind, und die Vorrichtung Mittel zur Druckerhöhung (9) und zur anschließenden teilweisen Verflüssigung (13, 14) des Gasstroms (5', 7), Mittel zur Einleitung des verflüssigten Teils (17, 18, 31) des Gasstroms als Kälteträger (31) in den Kondensator/Verdampfer (30), Mittel zur Einführung von in dem Kondensator/Verdampfer (30) der Niederdrucksäule erzeugter Flüssigkeit als Rücklauf (33) in eine He-Ne-H2-Säule (4) und Mittel zur Entnahmen des ultrareinen Stickstoffs (19, 20) in flüssigem Zustand aus der He-Ne-H2-Säule aufweist.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19852019 | 1998-11-11 | ||
| DE19852019 | 1998-11-11 | ||
| DE19924375 | 1999-05-27 | ||
| DE19924375 | 1999-05-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1001236A2 EP1001236A2 (de) | 2000-05-17 |
| EP1001236A3 EP1001236A3 (de) | 2000-11-08 |
| EP1001236B1 true EP1001236B1 (de) | 2004-09-29 |
Family
ID=26050074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99122146A Expired - Lifetime EP1001236B1 (de) | 1998-11-11 | 1999-11-05 | Verfahren zur Gewinnung von ultrareinem Stickstoff |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US6276172B1 (de) |
| EP (1) | EP1001236B1 (de) |
| JP (1) | JP2000180051A (de) |
| KR (1) | KR20000035406A (de) |
| CN (1) | CN1134640C (de) |
| AT (1) | ATE278166T1 (de) |
| CA (1) | CA2289173A1 (de) |
| DE (2) | DE19929798A1 (de) |
| ES (1) | ES2229608T3 (de) |
| SG (1) | SG74755A1 (de) |
| TW (1) | TW432191B (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10158327A1 (de) * | 2001-11-28 | 2003-06-18 | Linde Ag | Verfahren und Vorrichtung zur Herstellung hoch reinen Stickstoffs aus weniger reinem Stickstoff |
| DE10205094A1 (de) * | 2002-02-07 | 2003-08-21 | Linde Ag | Verfahren und Vorrichtung zur Erzeugung hoch reinen Stickstoffs |
| CN102959352B (zh) * | 2009-07-24 | 2016-07-06 | 英国备选能源国际有限公司 | 二氧化碳和氢气的分离 |
| CN102797974A (zh) * | 2012-07-31 | 2012-11-28 | 张立永 | 氢脉 |
| CN114165989A (zh) * | 2021-11-22 | 2022-03-11 | 四川空分设备(集团)有限责任公司 | 制取中压氮气的装置及方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4464188A (en) * | 1983-09-27 | 1984-08-07 | Air Products And Chemicals, Inc. | Process and apparatus for the separation of air |
| US5123947A (en) * | 1991-01-03 | 1992-06-23 | Air Products And Chemicals, Inc. | Cryogenic process for the separation of air to produce ultra high purity nitrogen |
| US5167125A (en) * | 1991-04-08 | 1992-12-01 | Air Products And Chemicals, Inc. | Recovery of dissolved light gases from a liquid stream |
| US5170630A (en) * | 1991-06-24 | 1992-12-15 | The Boc Group, Inc. | Process and apparatus for producing nitrogen of ultra-high purity |
| JP3306517B2 (ja) * | 1992-05-08 | 2002-07-24 | 日本酸素株式会社 | 空気液化分離装置及び方法 |
| US5351492A (en) * | 1992-09-23 | 1994-10-04 | Air Products And Chemicals, Inc. | Distillation strategies for the production of carbon monoxide-free nitrogen |
| FR2696821B1 (fr) * | 1992-10-09 | 1994-11-10 | Air Liquide | Procédé et installation de production d'azote ultra-pur sous pression. |
| JP3447437B2 (ja) * | 1995-07-26 | 2003-09-16 | 日本エア・リキード株式会社 | 高純度窒素ガス製造装置 |
| DE19640711A1 (de) * | 1996-10-02 | 1998-04-09 | Linde Ag | Verfahren und Vorrichtung zur Gewinnung von hochreinem Stickstoff |
| DE19806576A1 (de) * | 1998-02-17 | 1998-08-06 | Linde Ag | Verfahren und Vorrichtung zur Gewinnung von CO-freiem Stickstoff |
| US5906113A (en) * | 1998-04-08 | 1999-05-25 | Praxair Technology, Inc. | Serial column cryogenic rectification system for producing high purity nitrogen |
-
1999
- 1999-06-29 DE DE19929798A patent/DE19929798A1/de not_active Withdrawn
- 1999-10-29 TW TW088118824A patent/TW432191B/zh not_active IP Right Cessation
- 1999-11-05 DE DE59910646T patent/DE59910646D1/de not_active Expired - Fee Related
- 1999-11-05 AT AT99122146T patent/ATE278166T1/de not_active IP Right Cessation
- 1999-11-05 ES ES99122146T patent/ES2229608T3/es not_active Expired - Lifetime
- 1999-11-05 EP EP99122146A patent/EP1001236B1/de not_active Expired - Lifetime
- 1999-11-09 CA CA002289173A patent/CA2289173A1/en not_active Abandoned
- 1999-11-10 SG SG1999005577A patent/SG74755A1/en unknown
- 1999-11-10 JP JP11319519A patent/JP2000180051A/ja active Pending
- 1999-11-10 US US09/437,263 patent/US6276172B1/en not_active Expired - Fee Related
- 1999-11-11 CN CNB991238044A patent/CN1134640C/zh not_active Expired - Fee Related
- 1999-11-11 KR KR1019990049862A patent/KR20000035406A/ko not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CA2289173A1 (en) | 2000-05-11 |
| CN1255619A (zh) | 2000-06-07 |
| KR20000035406A (ko) | 2000-06-26 |
| ES2229608T3 (es) | 2005-04-16 |
| EP1001236A2 (de) | 2000-05-17 |
| JP2000180051A (ja) | 2000-06-30 |
| US6276172B1 (en) | 2001-08-21 |
| SG74755A1 (en) | 2000-08-22 |
| DE59910646D1 (de) | 2004-11-04 |
| ATE278166T1 (de) | 2004-10-15 |
| DE19929798A1 (de) | 2000-05-25 |
| TW432191B (en) | 2001-05-01 |
| CN1134640C (zh) | 2004-01-14 |
| EP1001236A3 (de) | 2000-11-08 |
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